吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (3): 778-788.doi: 10.13229/j.cnki.jdxbgxb201703013

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竹板增强胶合木梁受弯性能

郭楠1, 张平阳1, 左煜2, 左宏亮1   

  1. 1.东北林业大学 土木工程学院,哈尔滨 150040;
    2.哈尔滨工业大学 建筑学院,哈尔滨 150006
  • 收稿日期:2016-12-28 出版日期:2017-05-20 发布日期:2017-05-20
  • 作者简介:郭楠(1978-),男,副教授,博士.研究方向:现代木结构.E-mail:snowguonan@163.com
  • 基金资助:
    中央高校基本科研业务费专项资金项目(2572015CB29); 国家留学基金委项目(201606605044)

Bending performance of glue-lumber beam reinforced by bamboo plyboard

GUO Nan1, ZHANG Ping-yang1, ZUO Yu2, ZUO Hong-liang1   

  1. 1.College of Civil Engineering, Northeast Forestry University, Harbin 150040, China;
    2.College of Architecture, Harbin Institute of Technology, Harbin 150006, China
  • Received:2016-12-28 Online:2017-05-20 Published:2017-05-20

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摘要： 对21根竹板增强胶合木梁的抗弯性能进行了研究,对比分析了竹板层数和厚度影响下木梁破坏形态、极限荷载和跨中挠度等参数。试验结果表明,与纯胶合木梁相比,底部粘贴1~3层胶合竹板梁的破坏荷载提高了16.8%~45.9%,随着竹板层数的增加,梁变形能力增强,但层间错动明显,致使梁的承载力不升反降;竹板总厚度不变,每层竹板厚度的减小对竹板增强胶合木梁的破坏形态无明显影响,整体变形明显,延性提高;竹板增强胶合木梁跨中截面应变符合平截面假定,破坏时梁顶达到抗压强度且有一定塑性高度,梁底达到极限拉应变。提出了竹板增强胶合木梁抗弯承载力计算公式,验证了公式的合理性,并给出了竹板最佳厚度比。

关键词: 土木工程, 竹板增强胶合木梁, 抗弯性能, 破坏形态, 承载力计算

Abstract: The bending performances of 21 bamboo plyboard enhanced glue-lumber beams were studied. Under the effects of bamboo plyboard layer number and thickness, the timber beam failure modes, ultimate load and mid-span deflection parameters were analyzed. Experimental results show that, compared to pure glue-lumber beams, the failure load of beams, with 1-3 layers of scuffing bamboo plyboard on the bottom, is increased by 16.8% ~ 45.9%. With the increase in the number of bamboo plyboard layers, the deformation capacity of the beams becomes stronger. However, the intercalated sliding becomes more obvious, which makes the bearing capacity of the beams decreases instead of increases. When the total thickness of the bamboo plyboard remains the same, the decrease in the thickness of each layer bamboo plyboard has no obvious influence on the failure modes of glue-lumber beam reinforced by bamboo plyboard. The total deformation is obvious and the ductility increases. The span-section strain of reinforced glue-lumber boards accords with the plane section assumption. The glue-lumber on the top of the beams reaches the compressive strength and has a certain plastic height when failure occurs. The scuffing-bamboo on the bottom of the beams reaches to the ultimate tensile strain. A formula to calculate the flexural capacity of the bamboo plyboard enhanced glue-lumber beams was put forward, which was verified. The optimum ratio of the thickness of the bamboo plyboard was given.

Key words: civil engineering, bamboo plyboard enhanced glue-lumber beam, bending performance, failure mode, bearing capacity calculation

中图分类号: 

  • TU366.3
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